HOW TO KNOW THE BUTTERFLIES GEOGRAPHICAL DISTRIBUTION IN THE EAST OF THE FORMS OF THE SPRING AZUREBoreal America (Labrador to Alaska). Only one brood, dimorphic. C. ladon lucia. C. ladon violacea.Lat. 45°-4i° N. (Montreal to Long Island). Two broods. I. Winter Forms or first generation. C. ladon lucia. C. ladon marginata. C. ladon violacea. II. Summer Form or second generation. C. ladon neglecta.Lat. 4i°-38° or 39° N. (Long Island to West Virginia). I. Winter Forms or first generation. C. ladon violacea. C. ladon ladon. II. Summer Form or second generation. C. ladon neglecta.South of 38° or 39° N. (West Virginia to Gulf of Mexico). I. Winter Forms or first generation. C. ladon violacea (male and female). C. ladon violacea-nigra (male). C. ladon ladon. II. Summer Form or second generation. C. ladon neglecta. Remarkable organs exist in the seventh and eighth ab¬dominal segments of the larvae of certain Lycaenids. These 252